Finding the Fourth Proportional to 2,976.10, 4,105.15 and 1,915.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,976.10 : 4,105.15 = 1,915.25 : x
2. Step 2: Convert to fraction form
   2,976.10/4,105.15 = 1,915.25/x
3. Step 3: Cross multiply
   2,976.10x = 4,105.15 × 1,915.25
4. Step 4: Simplify right side
   2,976.10x = 7,862,363.22
5. Step 5: Solve for x
   x = 7,862,363.22/2,976.10
6. Step 6: Final answer
   x = 2,641.84